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Which risk increases when a pontoon bridge uses hemp rope subjected to repetitive stress?

A)Material creep starts decreasing elasticity
B)Catenary sag causes deck instability
C)Resonance amplifies wave-induced oscillation
D)Torsional buckling creates lateral instability

💡 Explanation

Material creep increases because cyclic loading leads to permanent deformation in hemp fibers due to disruption of hydrogen bonds between cellulose fibrils. Therefore, material creep decreases elasticity, making ropes more prone to stretching or failure under load, rather than immediate catastrophic breakage.

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